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<?php |
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declare(strict_types = 1); |
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/* |
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* Go! AOP framework |
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* |
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* @copyright Copyright 2011, Lisachenko Alexander <[email protected]> |
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* |
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* This source file is subject to the license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace Go\Instrument\ClassLoading; |
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use php_user_filter as PhpStreamFilter; |
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use Go\Instrument\Transformer\StreamMetaData; |
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use Go\Instrument\Transformer\SourceTransformer; |
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use RuntimeException; |
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use function strlen; |
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/** |
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* Php class loader filter for processing php code |
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* |
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* @property resource $stream Stream instance of underlying resource |
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*/ |
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class SourceTransformingLoader extends PhpStreamFilter |
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{ |
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/** |
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* Php filter definition |
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*/ |
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public const PHP_FILTER_READ = 'php://filter/read='; |
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/** |
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* Default PHP filter name for registration |
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*/ |
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public const FILTER_IDENTIFIER = 'go.source.transforming.loader'; |
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/** |
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* String buffer |
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*/ |
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protected $data = ''; |
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/** |
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* List of transformers |
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* |
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* @var SourceTransformer[] |
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*/ |
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protected static $transformers = []; |
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/** |
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* Identifier of filter |
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* |
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* @var string |
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*/ |
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protected static $filterId; |
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/** |
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* Register current loader as stream filter in PHP |
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* |
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* @throws RuntimeException If registration was failed |
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*/ |
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public static function register(string $filterId = self::FILTER_IDENTIFIER): void |
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{ |
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if (!empty(self::$filterId)) { |
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throw new RuntimeException('Stream filter already registered'); |
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} |
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$result = stream_filter_register($filterId, __CLASS__); |
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if ($result === false) { |
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throw new RuntimeException('Stream filter was not registered'); |
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} |
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self::$filterId = $filterId; |
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} |
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/** |
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* Returns the name of registered filter |
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* |
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* @throws RuntimeException if filter was not registered |
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*/ |
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public static function getId(): string |
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{ |
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if (empty(self::$filterId)) { |
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throw new RuntimeException('Stream filter was not registered'); |
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} |
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return self::$filterId; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function filter($in, $out, &$consumed, $closing) |
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{ |
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while ($bucket = stream_bucket_make_writeable($in)) { |
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$this->data .= $bucket->data; |
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} |
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if ($closing || feof($this->stream)) { |
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$consumed = strlen($this->data); |
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// $this->stream contains pointer to the source |
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$metadata = new StreamMetaData($this->stream, $this->data); |
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self::transformCode($metadata); |
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$bucket = stream_bucket_new($this->stream, $metadata->source); |
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stream_bucket_append($out, $bucket); |
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return PSFS_PASS_ON; |
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} |
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return PSFS_FEED_ME; |
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} |
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/** |
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* Adds a SourceTransformer to be applied by this LoadTimeWeaver. |
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*/ |
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public static function addTransformer(SourceTransformer $transformer): void |
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{ |
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self::$transformers[] = $transformer; |
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} |
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/** |
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* Transforms source code by passing it through all transformers |
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*/ |
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public static function transformCode(StreamMetaData $metadata): void |
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{ |
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foreach (self::$transformers as $transformer) { |
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$result = $transformer->transform($metadata); |
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if ($result === SourceTransformer::RESULT_ABORTED) { |
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break; |
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} |
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} |
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} |
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} |
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goaop /
framework
